Revenue (Narrative) (Details) - USD ($) |
6 Months Ended | ||
|---|---|---|---|
Oct. 31, 2018 |
Oct. 31, 2017 |
Apr. 30, 2018 |
|
| Disaggregation of Revenue [Line Items] | Ìý | Ìý | Ìý |
| Deferred revenue | $ 3,445,306 | Ìý | $ 1,814,136 |
| Refunds due students | $ 1,181,939 | Ìý | $ 815,841 |
| Sales Revenue, Net [Member] | Non-US [Member] | Ìý | Ìý | Ìý |
| Disaggregation of Revenue [Line Items] | Ìý | Ìý | Ìý |
| Percentage of revenues from students outside the United States | 1.70% | 2.20% | Ìý |
| X | |||||
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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